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Home >> Lexus >> 2007 >> RX 400h AWD >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Vehicle Control (P310) - RX400H - DTC P0A7A-309 Through P0A94-589 >> DTC P0A94-442 DC / DC Converter Performance >> Inspection Procedure

Inspection Procedure

CAUTION:
  • Before inspecting the high-voltage system, take safety precautions to prevent electrical shocks, such as wearing insulated gloves and removing the service plug grip. After removing the service plug grip, put it in your pocket to prevent other technicians from reconnecting it while you are working on the high-voltage system.
  • After disconnecting the service plug grip, wait for at least 5 minutes before touching any of the high-voltage connectors or terminals.

HINT:

At least 5 minutes is required to discharge the high-voltage capacitor inside the w/ converter inverter assembly.

  1. READ OUTPUT DTC (HV) 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the ignition switch to the ON position.
    3. (c Select the following menu items: DIAGNOSIS / OBD/ MOBD / HV ECU / DTC INFO / CURRENT CODES.
    4. Read output DTCs. (See DTC CHECK / CLEAR )

      Result: 

      The DTCs shown in the table below are output 

      DTCS RESULT DESCRIPTION

      DTC No. Relevant Diagnosis
      P0A1A (all details), P0A1B (all details), P0A1C (all details) MG ECU circuit malfunction
      P0A1D (all details) HV ECU circuit malfunction
      P0A3F-243, P0A40-500, P0A41-245 Motor resolver circuit
      P0A45-669, P0A46-671, P0A47-670 Rear motor resolver malfunction
      P0A4B-253, P0A4C-513, P0A4D-255 Generator resolver circuit
      P0A51-174, P0A55-687 MG ECU circuit malfunction
      P0A60 (all details), P0A63 (all details) Motor current sensor circuit
      P0A69 (all details), P0A6C (all details) Rear motor current sensor circuit
      P0A72 (all details), P0A75 (all details) Generator current sensor circuit
      P0A78 (all details) Motor inverter function malfunction
      P0A79 (all details) Rear motor inverter function malfunction
      P0A7A (all details) Generator inverter function malfunction
      P0A7F (all details), P0A80 HV battery system malfunction
      P0A82, P0A84, P0A85 HV battery cooling fan circuit malfunction
      P0A90 (all details) Motor function malfunction
      P0A91 (all details) Rear motor function malfunction
      P0A92 (all details) Generator function malfunction
      P0A94 (Except for 442) Boost converter circuit
      P0A95 HV battery high voltage fuse blown out
      P0AA1 (all details), P0AE6-225, P0AA4-232, P0ADB-227, P0ADC-226, P0ADF-229, P01E0-228, P0AE7-224 System main relay circuit
      P0AA6 (all details), P3004 (all details) High-voltage system
      P3000 (all details) HV battery system malfunction

      HINT:

      • Turning the ignition switch to the ON position with the service plug grip and inverter cover removed causes interlock switch system DTC P0A0D-350 to be output.
      • P0A94-442 may be output due to a malfunction which causes the DTCs in the table above to be output. In this case, first troubleshoot the output DTCs in the table above. Then, perform a reproduction test to check that no DTCs are output.

    YES: GO TO  DTC CHART 

    NO: Go to next step 

  2. CHECK CONNECTION CONDITION OF MG ECU CONNECTOR (LOOSENESS AND POOR CONTACT) 
    CAUTION: Be sure to wear insulated gloves.
    1. Turn the ignition switch off and remove the service plug grip. (See HYBRID CONTROL SYSTEM )
      NOTE: Do not put the vehicle into the READY-on state with the service plug grip removed as this may cause a malfunction.
    2. Remove the inverter cover. (See INVERTER WITH CONVERTER )
      NOTE:
      • Wrap the interlock round terminal for the inverter cover with vinyl tape to prevent it from shorting to ground.
      • Prevent water in the reservoir tank from entering the inverter.
      • Removing the inverter cover causes the MG ECU board to be exposed. Therefore, temporarily install the inverter cover for each area to be inspected.
    3. Check the connections of the MG ECU connectors.

      OK: Connectors are connected securely and there is no poor connection. 

    NG: CONNECT SECURELY 

    Fig 1: Identifying MG ECU Connector Terminals
    G05201350Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE W/ CONVERTER INVERTER ASSEMBLY 

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